Process and apparatus for recovery from rotating stall in axial flow fans and compressors
First Claim
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1. A compressor or axial flow fan, comprising:
- an inlet for admitting a working gas into said compressor or axial flow fan;
means for sensing rotating stall in said compressor or axial flow fan; and
means for injecting low density gas which is of a density that is lower than said working gas into said compressor or axial flow fan in response to the rotating stall sensed by said means for sensing rotating stall.
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Abstract
Active recovery from a rotating stall operating condition in an axial flow compression system is accomplished by altering the temperature and/or density of the working fluid flowing in the inlet of the compression system once rotating stall is detected. A burner is used to increase the compressor inlet flow temperature and concomitantly reduce the inlet flow density. Alternatively, a low density gas such as helium is injected into the compressor inlet. The ingestion of high temperature gases or other low density gases into the compressor energizes a dynamic response from the compression system that induces rotating stall recovery.
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Citations
15 Claims
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1. A compressor or axial flow fan, comprising:
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an inlet for admitting a working gas into said compressor or axial flow fan; means for sensing rotating stall in said compressor or axial flow fan; and means for injecting low density gas which is of a density that is lower than said working gas into said compressor or axial flow fan in response to the rotating stall sensed by said means for sensing rotating stall. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for recovering from rotating stall in a compressor or axial flow fan, comprising the steps of:
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sensing the rotating stall; injecting low density gas into an inlet for said compressor or axial flow fan after said rotating stall condition is sensed, said low density gas being of a density that is lower than a working gas introduced into said inlet during operation of said compressor or axial flow fan; and stabilizing said compressor or axial flow fan. - View Dependent Claims (12, 13, 14, 15)
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Specification